Gravity-dependent polarity of cytoplasmic streaming inNitellopsis

  title={Gravity-dependent polarity of cytoplasmic streaming inNitellopsis},
  author={Randy Wayne and Mark P. Staves and Andreas Leopold},
The internodal cells of the characean algaNitellopsis obtusa were chosen to investigate the effect of gravity on cytoplasmic streaming. Horizontal cells exhibit streaming with equal velocities in both directions, whereas in vertically oriented cells, the downwardstreaming cytoplasm flows ca. 10% faster than the upward-streaming cytoplasm. These results are independent of the orientation of the morphological top and bottom of the cell. We define the ratio of the velocity of the downward- to the… CONTINUE READING
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